Documents about building TV descrambler for US cable TV

• Jul 23, 2001

• #1

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yhk

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Does anyone have any literature on building a tv descrambler for USA cable TV. A circuit would be nice.
I think the sync signal is removed, so what can i do to reconstruct it back?
any ideas?

Thanks

 

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• Jul 23, 2001

• #2

padspcb

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3chip descrambler

Hi
There are 2 parts on your decoder.
The channel selector and the descrambler.
You get what you paid for, so the selector knows what is opened or closed.
If you select a closed channel, it will probably blink and say No No pal.
The easyest thing is to buy the cheapest cable selector you can find, those that only gets a channel and put it out on channel 3 or 4. Then you connect the output of this dumy to your selector. Place your selector on channel 3 or 4 and enjoy. I think it must be sufficiently stupid not to notice. And channel 3 or 4 must be a valid (open) one, so it will descramble it nicely to you.
But you must use a very dumb selector. Using your vcr will notdo, because it tries to reconstruct the missing h/v signals.
You may also reprogram the eeprom inside your receiver, or just cut the line that blanks the descrambler.
There are lots of solutions...
try astalavista.box.sk

 

• Jul 23, 2001

• #3

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yhk

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3 chip ssavi

I guess what I really want is the descrambler part. I can design and build a channel selector fairly easily.

Thanks anyways

 

• Jul 23, 2001

• #4

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C-Man

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cable decoder schematic

Try your luck here:
**broken link removed**
**broken link removed**

best regards

 

• Jul 23, 2001

• #5

D

dainis

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3chip+ssavi

look: http://members.rotfl.com/dturner/

 

• Feb 22, 2002

• #6

jhallows

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3 chip descramble

Read:

**broken link removed**

I have tested it on ssavi. But it sucks since you must re-sync on every channel.

 

• Feb 22, 2002

• #7

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GUGA

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pic descrambler

HI...

Go

h**p://peque.metropoliglobal.com/foros/index.php?viewcat=5

 

• Feb 22, 2002

• #8

macxom

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how to build a descrambler

seek in
h**p://pub31.ezboard.com/ftelevisionporcablefrm3

also seek in
http://www.geocities.com/ResearchTriangle/Node/5459/

 

• Feb 22, 2002

• #9

al_extreme

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digi-key-descramblers

I'm looking for a north america cable decoder
pcb soft etc.. the full stuff

 

• Feb 24, 2002

• #10

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juan_manuell

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how to design descrambler tv

Anybody knows were i found a replacement for CD2240 and CA3126E for TV descramblers

 

• Feb 24, 2002

• #11

jhallows

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ssavi 3 chips

I think CD2240 is a harris chip. Check Digikey, (I hope you are in North America)

 

• Feb 24, 2002

• #12

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charley10

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cable descrambler schematics

have also a look at the following link

h**p://www.netzagent.com/freetv/intro.htm
or
h**p://www.freetv.notricks.de

 

• Feb 24, 2002

• #13

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cadb0y

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chip descrambler

Anyone have info one new ntsc digital descrambling?

 

• Feb 24, 2002

• #14

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tek547

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soft descrambler

If you are going to build a board yourself, I would suggest the pic based approach. I first tried the color-burst pll sync regenerator circuit from Graf's TAB series book and then an early 3*chip pic based solution h**p://members.rotfl.com/dturner/. I do remember having to play with the agc cap in my vcr's tuner which was kind of a pain, but I would guess that this been solved by now. After having fun with it, I found it worthwhile to just buy a cheap ca*ble dec*oder box (many of which have the pic solution). The box is nice because it has a tuner and video/audio and channel 3/4 outputs. Good Luck

 

• Feb 24, 2002

• #15

jhallows

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pal m descrambler

I agree the pic version is better.

 

• Feb 24, 2002

• #16

D

dlancia

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descramble tv

do any of these possibly work with digital systems?

 

• Feb 24, 2002

• #17

F

fsiuru

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2 chip descrambler with pic16f84

I suggest to browse the following page

**broken link removed**

Interesting info about the 3chip descrambler (pic based) could be found there.

 

• Mar 4, 2003

• #18

S

System.out

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pic mcu + descrambler

fsiuru, i like that page, but if it is yours..... i would like it to continue your good work and do the PAL part signal.

Thanks

 

• Mar 6, 2003

• #19

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PeterG

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descrambler circuit pic 16f

Yeah! I agree that the best you can get with a little money is a project with a PIC.

Here you can find good projects to start with:
http://www.geocities.com/SiliconValley/Monitor/1802/

Cheers,
Peter Gabriel[/url]

 

• Jun 11, 2003

• #20

D

davorin

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descrambler circuit 3 chip

Well...just started the PAL PIC project as well here in Finland since more and more people here in our company get Cable-TV at home (o;

Hope to get a sample VCXO this week from jauch.de which was said to work perfectly (o;

With a normal XTAL circuit you get really good picture for TCM/Cartoon and Cinema1000. The others have a wavy picture and some brighter parts in the middle of the picture. Those channels don't give a picture at all when fed by a VCR.

Think the PIC soft needs some Scandinavian updates (o;


stay tuned (o;